Ment of scientific and industrial research



UNITED STATES PATENT OFFICE.

WALTER ROSENHAIN AND ERNEST H. RODD, OF TEDDINGTON, ENGLAND,

ASSIGNORS TO THEMSELVES, THE IMPERIAL TRUST FOR THE ENCOURAGE- MENT OF SCIENTIFIC AND INDUSTRIAL- RESEARCI-I, OF WESTMINSTER, ENGLAND, AND RICHARD TETLEY GLAZEBROOK, OF TEDDINGTON, ENGLAND.

BASIC ZIRGONIUM SULFATE.

Specification of Letters Patent. Patented J 24 1919 No Drawing. Original application filed October 13, 1917, Serial No. 196,471. Divided and this application filed November 14, 1918. Serial No. 262,587.

To all whom it may concern.-

Be it known that we, WALTER Rosnm mm and ERNEST HARRY Rom), both subjects-of the King of Great Britain, both residing in Teddington, England, have jointly invented certain new and useful Improvements in Basic Zirconium Sulfate, of which the following is a specification.

This invention relates to the manufacture of a new basic sulfate of zirconium which has the chemical formula 5ZI'O QSO J4H O and is sparingly soluble in water.

To manufacture this new compound there 'is first produced the basic oxychlorid of zir- By dissolving the basic oXychlorid in 30' times its Weight of water and adding to the solution sulfuric acid or a solution of a sulfate in the proportion illustrated by the equation Z1- O Cl +2H SO :5ZrO 2SO lHCl the new basic sulfate or zirconium is precipitated. 7

Having thus described the nature of the said invention and the best means we know of carrying the same into practical effect, we claim 1. As a new article of {manufacture a basic sulfate of zirconium which has the chemical formula 5ZrO. .2SO .14H O and is spar ingly soluble in water.

2. A process for producing basic sulfate of zirconium of the chemical formula 5ZrO .2SO .14:H O, which process consists in adding a substance containing the sulfate radical to a solution of the basic oxychlorid of zirconium Zr O Cl 22H O.

3. A process for producing basic sulfate of zirconium of the chemical formula 5ZrO 2SO 14H O, which processes consists in dissolving zirconium hydroxid in a mixture of hydrochloric acid and water, concentrating the solution until, on cooling, crystals form abundantly, re-crystallizing these crystals from hydrochloric acid, then re-dissolving them and adding a substance containing the sulfate radical to the solution.

In testimony whereof we have signed our names to this specification.

WVALTER ROSENHAIN. ERNEST H. RUDD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. O. 

